L11 - Multi sample compatibility mode Flashcards
what does the Chi-squared Test for two or more independent samples do?
it compares two or more samples to Infer similarity or differences of their parent population.
what are the assumptions for an independent multi sample Chi-squared test? (four of them)
- Nominal or higher
- Two mutually exclusive categories
- if only two categories the expected frequency in each must be greater than or equal to 5.
- If greater than 2 categories, no category should have an expected frequency less than 1, no more than 20%, an expected frequency less than 5.
what does the p-represent in a chi-squared multi-sample compatibility test?
using an arbitraty significance level of alpha (0.01, 0.05) we can determine whether or we reject the null hypothesis if our p-value is above or below it .
with a significance value of 0.05 and a P-value of 0.123, do we reject or fail to reject the null hypothesis? (the null hypothesis states that there is no statistical difference between the datasets)
the calculated p-value is above the significance level, meaning that we reject the null hypothesis.
what does a Kolmogorov-Smirnov two sample test do?
it is used to measure statistically significant variance between two mutually exclusive categories.
what are the two assumptions that must be met for a kolmogorov-Smirnov two sample test?
- observations are independent events measured at the ordinal scale or higher
- there are at least 2 mutually exclusive categories
what does Mutually Exclusive mean?
two events or datasets that cannot occur at the same time.
what is a Likert scale
a scale that has things like:
- strongly agree
- agree
- neutral
- agree
- Strongly Agree
what kind of test is used to measure difference between two samples
Kolmogorov-Smirnov and Chi-squared test.
What is a compatibility mode
it is a measure of compatibility between two datasets.
